Actually that's for my guage. I think I did tap the wide band power to the radio power feed.
And you don't want to use the cig lighter as it isn't a swithed 12v source.
As for the ignition I have posted that before. Iirc I used the yellow wire so that my guage turn on in the ass. possition as well as the run position of the ignition.
98.5 Black/Midnight Blue SVT-Build # 6122 - Resonator Replaced with GlassPack - NPG CAI - MSDS Headers - TruBendz y-pipe - Port-matched 3L with SVT cams.